2" tachometer gauge

• 2022-06-29

We have different size of tachometer gauge , include the 2" tachometer gauge.

What is the function of 2" tachometer gauge ? The first thing is to tell us that the car engine has started at this time. After all, some cars don't vibrate very much when starting . Sometimes they can't even notice it if they don't pay attention. The tachometer can tell us that the engine of the car is running . In this case, we should change the gear in time . Avoid unreasonable operation that may cause damage to our engine .

Another point is to tell us which gear to switch. We all know . The speed of the engine has something to do with our gear . For example , when going uphill , we should pursue low speed and high horsepower, while when going downhill , we can pursue low high speed and low horsepower . In addition , the 2" tachometer gauge can also tell us the current operating condition of the engine and help us check whether the car has any faults . Especially when the engine speed does not match our current speed, there are often some problems .

When the ignition controller turns on the primary circuit , VT is in the cut-off state and C2 is charged . Its charging circuit is : battery positive pole → R3 → C2 → VD2 → battery negative pole , forming a circuit . When the ignition controller cuts off the primary circuit , the base of the triode VT is turned on with a positive potential . At this time , C2 forms a discharge circuit through the turned on triode VT , ammeter A and VD1 to drive the ammeter . When the engine is working, the primary circuit is continuously on and off, and the times of on and off are proportional to the engine speed . Therefore, when the primary circuit is continuously on and off , the capacitor C2 is continuously charged and discharged. The average discharge current is proportional to the engine speed , so the average current is calibrated as the engine speed . It can be seen that the higher the engine speed, the more times of charge and discharge , the greater the average value of current , and the greater the value indicated by the 2" tachometer gauge .